1155038031809 has 2 divisors, whose sum is σ = 1155038031810. Its totient is φ = 1155038031808.

The previous prime is 1155038031799. The next prime is 1155038031841. The reversal of 1155038031809 is 9081308305511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1123275663409 + 31762368400 = 1059847^2 + 178220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155038031809 - 2¹² = 1155038027713 is a prime.

It is a super-2 number, since 2×1155038031809² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1155038031809.

It is not a weakly prime, because it can be changed into another prime (1155038031409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577519015904 + 577519015905.

It is an arithmetic number, because the mean of its divisors is an integer number (577519015905).

Almost surely, 2^{1155038031809} is an apocalyptic number.

It is an amenable number.

1155038031809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155038031809 is an equidigital number, since it uses as much as digits as its factorization.

1155038031809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 1155038031809 in words is "one trillion, one hundred fifty-five billion, thirty-eight million, thirty-one thousand, eight hundred nine".